docs: def gfoclt(occtyp, front, fshape, fframe, back, bshape, bframe, abcorr, obsrvr,
             step, cnfine, result=None):
      """
      Determine time intervals when an observer sees one target
      occulted by, or in transit across, another.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/gfoclt_c.html
  
      :param occtyp: Type of occultation.
      :type occtyp: str
      :param front: Name of body occulting the other.
      :type front: str
      :param fshape: Type of shape model used for front body.
      :type fshape: str
      :param fframe: Body-fixed, body-centered frame for front body.
      :type fframe: str
      :param back: Name of body occulted by the other.
      :type back: str
      :param bshape: Type of shape model used for back body.
      :type bshape: str
      :param bframe: Body-fixed, body-centered frame for back body.
      :type bframe: str
      :param abcorr: Aberration correction flag.
      :type abcorr: str
      :param obsrvr: Name of the observing body.
      :type obsrvr: str
      :param step: Step size in seconds for finding occultation events.
      :type step: float
      :param cnfine: SPICE window to which the search is restricted.
      :type cnfine: spiceypy.utils.support_types.SpiceCell
      :param result: Optional SPICE window containing results.
      :type result: spiceypy.utils.support_types.SpiceCell
      """
      assert isinstance(cnfine, stypes.SpiceCell)
      assert cnfine.is_double()
      if result is None:
          result = stypes.SPICEDOUBLE_CELL(2000)
      else:
          assert isinstance(result, stypes.SpiceCell)
          assert result.is_double()
      occtyp = stypes.stringToCharP(occtyp)
      front = stypes.stringToCharP(front)
      fshape = stypes.stringToCharP(fshape)
      fframe = stypes.stringToCharP(fframe)
      back = stypes.stringToCharP(back)
      bshape = stypes.stringToCharP(bshape)
      bframe = stypes.stringToCharP(bframe)
      abcorr = stypes.stringToCharP(abcorr)
      obsrvr = stypes.stringToCharP(obsrvr)
      step = ctypes.c_double(step)
      libspice.gfoclt_c(occtyp, front, fshape, fframe, back, bshape, bframe,
                        abcorr, obsrvr, step, ctypes.byref(cnfine),
                        ctypes.byref(result))
      return result